Improvement in rotary pumps



- daitdwf @stent tiijiiw.

" WILLIAM/B.- ALLYN, or BosroN,` MAssAcHUsErrs.

Letters Patent No.104,40.f5, dated .Tune 21, 1870.

IMPROVEMENT IN" ROTARY PUMPS.

The 'Schedule referred tain these Letters Patent and making part of Athe same- "11 To all whom it may conce/rn.-

Beit known that I, WILLIAM` B. .ALLYN, of Boston, inthe county of Suffolkland State of Massachu eccentric. on acentral shaft and It-consists in the`c'oustructionfand arrangement hereinafter described.z y.

` yIn the accompanyingdrawing l n Figure 1` is a vertical section of the pump on the line a; a; oflig. 2.' f

` Figure 2 is acentral vertical section of iig. 1 on the Udine/yy.' i .t i i Figure 3 is a sectional side view showing the waterorifice.` g f `Figureg is a modification of figs. 1 and 2. l Similar letters of reference indicate' corresponding -`,parts. 4.

Ais the shell creasing, which is acylinder open at both ends, with flanges, B, for fastening it down tor `any fixture.

'. O G represent the heads fastened on theends of the cylinder A by screws.

Each head `has an' inward central hub, D, through which thefdriving-shaft E works or is revolved. by

meansf of the `crank F, or by any other suitable means.`

` G is thepiston, which is a cylinder, with a lcentral a partition, H, in,` which is a `central orilice and waterf apertures, I I, as seen ing. 1.1 The piston also has ,y l a slot, by means of which f xedabuiment J.

K is an eccentric on the shaft, which works 'in' the central oriiic'e in the piston. The eccentric is adj usted or secured firmly in placeby means of a set-screw and a curved or schlich-cular bar, as shown in figs. land 2.

, The throw of the eccentric is equal to the difference *in the diametcrfoi" the piston and the cylinder in in contact with the interior surface ofthe cylinder,

is oscillated by theyecc'entric i L and Mrepresent the orices for theingress and egress of. the water, one on .each side of theabutvget ont of order.

it is connected with the` which it works, so that, as the shaft and eccentric re. volvc, the outrsnrface of thek pistonis carried around without revolving, but sliding onv the abutment as it ment, as represented in g. 3, where the abutment is seen in dotted lines. .v While the exterior surface of the piston is operating in connection with the casing to force water from the variable annular space 4between the two, the inner cylinders of the piston, on each side of the partitionj,

H, are working in connection with the hubs D D of the heads in the same manner. These interior cylinders receive -water as the piston descends on the abutment, and after the outer surface has commenced forc t ing the water from the outer cylinders, so that the `pressure is constant, and the steam discharged nni form in volume.

The central partition H of the piston works wat-ertight between the two hubs D D, thus making three l compartments or cylinders into which water enters,l

and from which it is forced at every revolution of the shaft. l

.When itA is desired to pass the water'in and out through the edge of the pump instead of the side, as seen, cleats on the piston and grooves in the casing and hubs vmay be arranged as seen in fig. 4.

These cleats prevent a direct Ycommunication bc-v tween the sides of the cylinder during any part of the stroke.

It .will be seen that this 4pump works with very durable, and'not liable to little friction; it is therefore In the use of this pump I do not, of course, confine Vmyself to pumping water, as it is obvious that it may be employed for various other liqnidswith equal advantage. It may also beI used for pumpng'air, and may be used as a motor for either steam or waternnder pressure. f

Having thus described my invention,

I claim as new and desire to secure by Letters latentl l 1. The cylinder-piston G, and hubs D D, operating in combination, substantially as and for the purposes described.

.2. The combination of the double-cylinderpiston G, with the casing A, arranged and operating as de scribed. x

3. 'Ihe'abutment J, in combination with the piston i G, arranged and operating substantially as and for theV purposes described.

- WILLIAM B. ALLYN.

Witnesses A. W. Amicis, J. N. DURELL.' 

